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IEC 60050-113:2011 gives the general terminology on physical concepts used in the fields of electricity, electronics and telecommunications. Its target is to collect the most usual concepts in space and time, macroscopic physics, mechanics, thermodynamics, particle physics, and solid-state physics, and to present them as terms and descriptions given in logical order according to their interdependence. The descriptions are definitions from the terminological point of view, but they are not always complete definitions in physical sense. Their main goal is to distinguish among particular concepts. In consequence, this part of the IEV should not be regarded as a physical textbook, but rather as a set of terms with their equivalents in many languages and with descriptions in the main IEV languages. This first edition cancels and replaces Sections 111-13, 111-14 and 111-16 of International Standard IEC 60050-111:1996 and its Amendment 1:2005. It has the status of a horizontal standard in accordance with IEC Guide 108.